Java网络编程实例---------------------------------复杂些的HTTP客户端

发送HTTP 1.0请求和保存返回数据，要求HTML和Image

package com.bq;

import java.io.BufferedReader;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.InetAddress;
import java.net.Socket;

/**
 * 一个使用HTTP1.1的客户端
 * @author 白强
 * @version 1.0
 */
public class ModifiedClient {
    private Socket moditifiedClient;
    private String hostName;
    private BufferedReader response;
    private String responseMessage="
";
    private PrintWriter sender;
    /**
     * 构造方法
     */
    public ModifiedClient() {
        try {
            System.out.println("Input hostName:");
            BufferedReader wt = new BufferedReader(new InputStreamReader(
                    System.in));
            hostName = wt.readLine();
            InetAddress address = InetAddress.getByName(hostName);
            moditifiedClient = new Socket(address, 80);
            sender = new PrintWriter(moditifiedClient.getOutputStream());
            response = new BufferedReader(new InputStreamReader(
                    moditifiedClient.getInputStream()));
            Get();

        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public static void main(String[] args) {
        new ModifiedClient();
    }
    
    /**
     * 取得数据
     * @throws Exception
     */
    private void Get() throws Exception {
        try {
            // 从浏览器抄来的
            String command = "GET "
                    + "/"
                    + " HTTP/1.1
"
                    + "Host:"
                    + hostName
                    + "
"
                    + "Connection:keep-alive"
                    + "
"
                    + "Cache-Control:max-age=0"
                    + "
"
                    + "Accept: */*" 
                    +"
"
                    + "Accept-Charset:GBK,utf-8;q=0.7,*;q=0.3"
                    + "
"
                    + "Accept-Language:zh-CN,zh;q=0.8"
                    + "
"
                    + "User-Agent: Mozilla/5.0 (Windows NT 5.1) AppleWebKit/535.7 (KHTML, like Gecko) Chrome/16.0.912.75"
                    + "
"
                    + "Cookie:JSESSIONID=7F7043A91B93CA3389843BE025113D9A"
                    + "

";
            sendMessage(command);
            String header = response.readLine();
            System.out.println(header);
            if (header == null) {
                System.out.println("Exit!!!");
                System.exit(1);
            } else {
                while (header.length() > 0) {
                    System.out.println(header);
                    header = response.readLine();
                }
            }
            saveMessage();
        } catch (IOException i) {
            i.printStackTrace();
        }

    }
    /**
     * 保存接收到的HTML文件
     * @throws Exception
     */
    private void saveMessage() throws Exception {
        String str = "";
        while ((str = response.readLine()) != null) {
            responseMessage += str + "
";
        }
        System.out.println(responseMessage);
        System.out.println("Input fileName:");
        BufferedReader wt = new BufferedReader(new InputStreamReader(System.in));
        String fileName = wt.readLine();
        FileOutputStream fileoutputstream = new FileOutputStream(fileName);
        fileoutputstream.write(responseMessage.getBytes("GBK"));
        System.out.println("file saved");
    }
    /**
     * 发送请求
     * @param data
     * @throws IOException
     */
    private void sendMessage(String data) throws IOException {

        sender.print(data);
        sender.flush();
    }

    public void setHostName(String hostname) {

        this.hostName = hostname;
    }

}